Portable speaker



FIG. 1 is a front perspective view of the portable speaker of the present invention showing my new design;

FIG. 2 is a front side elevational view thereof;

FIG. 3 is a back side elevational view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is another side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

The broken lines in the drawings illustrate features of the portable speaker that form no part of the claim. 

CLAIM The ornamental design for a portable speaker, as shown and described. 